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Combining readout circuits for QWC pauli strings in the measure_pauli_strings method #7416

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Merged
merged 12 commits into from
Jun 24, 2025

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ddddddanni
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@ddddddanni ddddddanni commented Jun 11, 2025

PR #7236 adds the feature to measure groups of qubit-wise-commuting Pauli operators simultaneously.

However, the current implementation generates a separate readout circuit for each individual Pauli operator within a group. This leads to non-simultaneous measurements, which is corrected in this PR.

@github-actions github-actions bot added the size: M 50< lines changed <250 label Jun 11, 2025
@github-actions github-actions bot added size: S 10< lines changed <50 and removed size: M 50< lines changed <250 labels Jun 11, 2025
@github-actions github-actions bot added size: M 50< lines changed <250 and removed size: S 10< lines changed <50 labels Jun 11, 2025
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codecov bot commented Jun 11, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.69%. Comparing base (bcd9528) to head (a3d705e).
Report is 1 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #7416      +/-   ##
==========================================
- Coverage   98.69%   98.69%   -0.01%     
==========================================
  Files        1112     1112              
  Lines       97966    97993      +27     
==========================================
+ Hits        96688    96714      +26     
- Misses       1278     1279       +1     

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@ddddddanni ddddddanni marked this pull request as ready for review June 11, 2025 17:02
@ddddddanni ddddddanni requested review from vtomole and a team as code owners June 11, 2025 17:02
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@eliottrosenberg eliottrosenberg left a comment

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Works great! Thanks, @ddddddanni! Tested in this colab.

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Works great! Thanks, @ddddddanni! Tested in this colab.

Thank you!! I will wait for Nour to give a stamp and submit this

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@NoureldinYosri NoureldinYosri left a comment

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thanks @ddddddanni , overall looks good, just a couple of nits + coverage

qubits_to_error: SingleQubitReadoutCalibrationResult, readout_qubits: list[ops.Qid]
) -> SingleQubitReadoutCalibrationResult:
"""Builds a calibration result for the specific readout qubits."""
return SingleQubitReadoutCalibrationResult(
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nit: this should be a SingleQubitReadoutCalibrationResult method

class SingleQubitReadoutCalibrationResult:
    ...


    def readout_result_for_qubits(self, qubits) -> 'SingleQubitReadoutCalibrationResult':
         ...

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Sure! Moved the method to under SingleQubitReadoutCalibrationResult

@@ -217,6 +217,31 @@ def _normalize_input_paulis(
return cast(dict[circuits.FrozenCircuit, list[list[ops.PauliString]]], circuits_to_pauli)


def _extract_readout_qubits(pauli_strings: list[ops.PauliString]) -> list[ops.Qid]:
"""Extracts unique qubits from a list of QWC Pauli strings."""
qubits = set()
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nit:

Suggested change
qubits = set()
return sorted(set(q for ps in pauli_strings for q in op.qubits))

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Done!

@ddddddanni ddddddanni requested a review from mrwojtek as a code owner June 23, 2025 22:23
@eliottrosenberg eliottrosenberg added this pull request to the merge queue Jun 23, 2025
Merged via the queue into quantumlib:main with commit b1ff3ae Jun 24, 2025
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BichengYing pushed a commit to BichengYing/Cirq that referenced this pull request Jun 25, 2025
…uli_strings``` method (quantumlib#7416)

[PR quantumlib#7236](quantumlib#7236) adds the
feature to measure groups of qubit-wise-commuting Pauli operators
simultaneously.

However, the current implementation generates a separate readout circuit
for each individual Pauli operator within a group. This leads to
non-simultaneous measurements, which is corrected in this PR.
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3 participants